import React, { Component } from "react";
import store from '../../redux/store'
import {createIncrementAction,createDecrementAction,createIncrementAsyncAction} from '../../redux/count_action'

export default class Count extends Component {
  state = { carName:'保时捷911' };
  componentDidMount(){
    store.subscribe(()=>{
      this.setState({})
    })
  }
  
  increment = () => {
    const { value } = this.selectNum;
    store.dispatch(createIncrementAction(value*1))
  };
  decrement = () => {
    const { value } = this.selectNum;
    store.dispatch(createDecrementAction(value*1))

  };
  incrementIfOdd = () => {
    const { value } = this.selectNum;
    const  count  = store.getState();
    if (count % 2 !== 0) {
      store.dispatch(createIncrementAction(value*1))

    }
  };
  incrementAsync = () => {
    const { value } = this.selectNum;
    createIncrementAsyncAction(value*1,300)
  };
  render() {
    return (
      <div>
        <h2>当前求和为：{store.getState()}</h2>
        <select
          ref={(c) => {
            this.selectNum = c;
          }}
        >
          <option value="1">1</option>
          <option value="2">2</option>
          <option value="3">3</option>
        </select>
        &nbsp;
        <button onClick={this.increment}>+</button>&nbsp;
        <button onClick={this.decrement}>-</button>&nbsp;
        <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
        <button onClick={this.incrementAsync}>异步加</button>&nbsp;
      </div>
    );
  }
}
